Thermo-Mechanically Modification of Amorphous Polyester Fibres: Іі. Calorimetric Investigations

Abstract

The present work is devoted to the investigation of the structure developments in as-spun amorphous poly (ethylene terephthalate) (PET) occurred as a result of heat mechanical treatments. The deformation behavior of as-spun amorphous poly (ethylene terephthalate) (PET) yarns subjected to simultaneous thermal and mechanical treatments has been studied. It was found that the applied tensile force simultaneously with the linear heating of the studied PET yarns strongly affects the samples deformation behaviour. Differential scanning calorimetry (DSC) has been used to study the structural rearrangements in the thermo-mechanically processed PET fibers occurred as a result of the treatment structural changes. Have been established dependencies between the parameters of the thermal deformation experiment and occurred in the samples structural changes.

CALCULATION OF THE EINSTEIN COEFFICIENTS FOR CO DOPED (80 − x)Sb2O3−20Na2O−xWO3 (x% mol of WO3) GLASSES

“…Spectroscopic studies on transition metal doped glasses have been implemented in the scope of active applications while the ability of tungsten, to have several oxidation states open possibilities for their application in the laser technologies. These materials are suitable for the study of the macromolecular segments arranged in the crystalline phase with the various X-ray methods [5]. This is the reason of the investigation of Co doped (80−x)Sb 2 O 3 −20Na 2 O−xWO 3 in our work.…”

“…500 cm -1 as follow: 1 -10 mol% WO 3 ; 2 -20 mol% WO 3 ; 3 -30 mol% WO 3 ; 4 -40 mol% WO 3 ; 5 -50 mol% WO 3 .JOURNAL SCIENTIFIC AND APPLIED RESEARCH Vol 5,. 2014 …”